Description
BluePrint MBP3550CT GM 355 Base Marine Engine, Cast Iron Vortec Heads
True Blue Power! BluePrints pro engine builders are enthusiasts just like you and it shows in the quality and performance of every engine they build. Each BluePrint crate engine is carefully dyno tested and ships with printed, proven results. If you’re looking serious horsepower at an affordable price, BluePrint Engines is the choice for you!
GM 355 Base Marine Engine – Cast Iron Vortec Heads – Flat Tappet Cam
Overview
- HP & Torque: 365 HP / 390 FT LBS
- Compression Ratio: 9.5:1
- Cast Iron Heads
- Hypereutectic Pistons
- Flat Tappet Cam
- Cast Steel Crank
- Part #: MBP3550CT
Block
- Seasoned 4 bolt main block
- One piece rear main seal
- Max bore .040
- Align honed main bearing bore
- Sonic tested to assure wall thickness
Rotating Assembly
- New cast steel crankshaft-externally balanced
- Chevy heavy beam rods resized and clearance improved
- 150,000 PSI rod bolts
- Keith Black Hypereutectic pistons
- Hastings moly rings
- New Hydraulic flat tappet camshaft
- Heavy duty double roller timing
Cylinder Heads
- GM Vortec cast iron cylinder heads
- 1.25 dia. valve springs, hardened retainers and keepers
- 2.02 swirl polished intake valves
- 1.60 swirl polished exhaust valves
- Elgin hardened push rods
- Long slot rockers with positive lock adjusting nuts
Cam Specs
- Cam Type: Flat tappet
- .480 Intake .489 Exhaust
- 226 Intake / 236 Exhaust duration
- @ .050 – 112 degree lobe separation
Ignition Timing
- 34 degrees at 3500 rpm
Also Includes
- New cast iron marine intake
- Polished aluminum valve covers
- Rubber coated steel oil pan
- Brass freeze plugs
- All engines are dyno tested on a state of the art DTS dyno and ship with a complete spec sheet
Warranty
- 12 month unlimited hour on pleasurecraft only. No warranty on commercial use.
| KEY SPECS | |
|---|---|
| MFG. Part # | MBP3550CT |
| Brand | BluePrint Engines |
| Crate Engine Type | Long Block |
| Engine Displacement | 355 cu. in. |
| Horsepower | 365 horsepower |
| Compression Ratio | 9.5:1 |
| Torque | 390 ft./lbs. |
| Camshaft Type | Hydraulic Flat Tappet |
| Cylinder Head Material | Cast Iron |
| Piston Material | Hypereutectic Aluminum |
| Crankshaft Material | Cast Steel |
| Camshaft Duration (.050 in) | 226° intake / 236° exhaust |
| Camshaft Lift (in) | .480 intake / .489 exhaust |
| Bore x Stroke (in) | 4.000″ bored .040 over x 3.480″ |
| Intake Manifold Included | Yes |
| Distributor Included | No |
| Valve Covers Included | Yes |
| Cylinder Heads Included | Yes |
| Rear Main Seal Style | 1-piece |
| Oil Pan Included | Yes |
| Timing Cover Included | Yes |
| Water Pump Included | No |
| Harmonic Balancer Included | No |
| Flexplate Included | No |
| Flywheel Included | No |
| Air Cleaner Included | No |
| Spark Plug Wires Included | No |
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